Diamond polishing adjusting device and dop



Dec. 24, 1957 M. J. LEIMAN 2,817,194

DIAMOND POLISHING ADJUSTING DEVICE AND DOP Filed June 28. 1954 Tlrzzll 1| l Vl" mi. i H

2 Sheets-Sheet 1 .5/ 47d 4 2 INVENTOR` Dec. 24, 1957 M. J. I EIMAN 2,817,194

y DIAMOND PoLIsHmG ADJusTING Dmca AND DoP Fuga June 2a, 1954 Y 2 sheets-sheet z :aired DIAMOND POLISHING ADJUSTIN G DEVICE AND DOP This invention relates to diamond polishing adjusting devices and has for its main object to provide improved means for setting the horizontal and vertical angles of each face of the diamond to be polished on the grinding wheel, which two settings today are arrived at by a great number of time-consuming and tedious trials and tests. And also to provide an improved diamond clamping mechanism for use in diamond chucks or dops, said mechanism being particularly eiective in use together with my angle setting device and also generally desirable for use in conjunction with any methods heretofore employed for the grinding -and polishing of diamonds.

Another object of this invention is to provide a device as indicated hereinbefore, which will be readily adapted to be inserted into the Aequipment used at present by diamond polishers.

Another object of this invention is to provide a device as indicated above which will -be simple in construction, easy to apply and use, inexpensive to manufacture, involving no change in the operation of diamond polishing, with the exception of the great advantages in the novel adjustment of the two angles through my invention together with the improved mechanism for clamping of diamonds in polishing chucks.

Still other objects of ythis invention will be apparent .as the specification of the same proceeds or will be pointed out therein.

In the drawings forming a part :of this specification and accompanying the same:

Fig. 1 is a side view of a usual diamond polishing arm, or tong as it is called in this art, showing my invention applied thereto;

Fig. 2 is a detailed front or end view thereof taken in the direction of arrow 2 of Fig. 1 showing the mechanism controlling the vertical angle of my device.

Fig. 3 is an enlarged view taken in the direction of arr-ow 3 of Fig. 2 showing the mechanism controlling the horizontal angle of my device.

Fig. 4 a perspective view of la dop into which is built a novel clamping mechanism.

Fig. 5 a sectional view of dop shown in Fig. 4 taken on line 5--5 of Figure 4.

Fig. 6 is a sectional view of dop of Fig. 5.

Fig. 7 is a detailed view of a post showing internal slot.

Referring now to the drawings', more in detail by characters of reference, the numeral 10 indicates a usual polishing arm -or tong as used by diamond polishers today, the same having adjustable legs 11, by which the inner end thereof may rest on an appropriate support, like a working Itable 12, while at the outer end thereof it carries the diamond receiving chuck or dop 13.

The diamond is indicated at 14, secured in said chuck 'as it is well known and as it will be explained hereinafter', and is engaged by the rotating grinding disk or wheel 15.

As has been indicated hereinbefore, the tong 10.and

taken on line 6-16 rates Patent 2,817,194` Patented Dec. 24, 1957` the dop 13 are the usual devices now used by diamond polishers. Diamond polishers however, now have a d1f ferent way of securing the dop 13 at the outer end 16 of the tong than the one illustrated herein and invented b me.

yA rigid rod 17 is inserted into a bore 18 which is near the outer end of the tong 16 and is secured by means of a set screw 19 which is threaded through the outer end of the tong 16 and exerts pressure against the rod 17 sultlcient to permit controlled rotation of the pin 17 within the bore 18, said rotation being necessary to find the grain along which the diamond will grind.

The supporting legs 11, two of them being used at the sides of the inner end 20 of the tong, will also be adjusted as to height, and secured in ltheir position, as by' the set screws 21. First, however, the tong 10 is carefully levelled, both in the longitudinal and transverse directions, as is well known to those versed in this art.

The diamond polishing will be executed by the polisher holding the tong 10 in its adjusted position.

As it is well known, the diamond 14 must be adjusted as to its position, angularly, both vertically and horizontally. The chuck or dop 13 is adjusted through rotation on both horizontal and vertical axes.

According to my invention, the rigid, non-ilexible rod 17, will be secured in the bore 18 near the -outer end 16 of the usual tong, but a novel adjusting device, generally indicated by the numeral 23, will be interposed between the rod 17 and the dop 13, said device 23 permitting an easy, accurate and controlled adjustment lof Ithe dop in the two desired angular positions and then permitting a rotation of the dop, without disturbing its two angular settings, around .the rod 17, or on a vertical axis, whereby the diamond is set to the best direction for grinding along the grain.

In my device 23, a horizontal plate or bar 24 will be secured to rotatable rod 17 as by having the lower end of rod 17 inserted into the center of rectangular bar 24 and secured therein by means of cross-pin 25.

Two vertical bars 26 and 27 of unequal length are secured to rectangular bar 24 at either end of said bar by any appropriate means thus forming an inverted U-shaped or yoke like member consisting of bar 24 and legs 26 and 27 reaching downward from bar 24 on either side thereof.

Two co-axial bores 29 and 30 through vertical bars 26 and 27 provide a horizontal channel through which shaft 28 is inserted.

A horizontal plate 31 may be integral with or be otherwise attached to horizontal shaft 28 by suitable means and extend horizontally outward therefrom a suii'icient length to accommodate dop 13 which is attached to the lower side of horizontal plate 31. The dop 13 is secured to horizontal plate 31 by means of a screw threaded pin 32 which is inserted into a threaded socket of dop 13 and passes through a sleeve 33 which is attached to and made a part of a vertical bore 34 through horizontal plate 31. The pin 32 is secured in said sleeve 33 by means of a set screw 35 threaded through wall of sleeve 33. Set screw 35 is adjusted to supply just enough tension for rotation of pin 32 without play and thereby rotation for horizontal or lateral angular adjustment of dop 13.

A lever 36 is Secured vertically to outer end 28a, see Fig. 1, of horizontal shaft 28 by means of a sleeve arrangement 36a made by forking the upper end of lever 36. The sleeve encircles shaft 28 at its outer end 28a and is tightened against it by a screw 37 threaded through both sides of divided sleeve 36a at its uppermost end and passing through slot 38 separating the forked sides of sleeve 36a.

A rectangular plate 39, see Figs. l and 2, is secured to lower end of the vertical yoke leg 27 by suitable means. A raised edge 40 on plate 39 is threaded to receive a knurled thumb screw 41 which advances against lever 36, causing rotation of shaft 28 and thereby adjusting vertical angle of dop 13 and diamond14.

f .It isimportant to have platform 31-extend suiciently beyond shaft 28 in order to form a right angleconnection with pin 32 within dop 13 so that the distance from the diamond toV the `point Aof jointure of pin 32with-platform 31 is equal to the length of extension platform 31 from shaft 28. This equi-distant right angular-construction serves to maintain .diamond 14 always centered ybeneath yoke.24 in proper cutting position. Constant centering of the diamond with a maximum 8 arc under its supporting yoke avoids costly damage'to the stone by maintaining the same facet in arms 52 no matter :what

other adjustments are made tothesdevice 23. iIn this connection it is noted that the yoke revolving with rod 17 always remains parallel to the grinding wheel.

It will be vseen that this .improved construction enables the polisher advantageously to center his working operations on a selectedk area of the polishing or cutting wheel.

A raised edge 42 on opposite end of plate 39 is threaded to receive screw 43 which is:advanced to carry a torsion or similar spring 44 at inner end ofsaid screw against pin 36b.which is set in lever 36. Spring 44 resists advance of .lever 36 and serves to lock it n-position or to cause return of lever 36 against thumbscrew 41 as desired.

ASuch construction effects immediate positive action of clamp lever 36 controlling shaft -23 by the slightest turn of screw 41. This improved control of the vertical angular adjustment results from the delicately adjusted counter-action of screw 41 and torsion spring 44 on either side of lever 36. Applicant thus avoids use of lock screws with their undesirable tendency to displace the facet when released to make corrections and to lag two or three turns before catching in reverse direction and pulling the dop with it.

Attached to upper side of platform 31 as in Fig. 3 is a means for controlled adjustment of the horizontal angle of diamond 14. A lever 45 is secured to pin 32 by means of screw 46. Thumb screw 47 is threaded through raised edge 48 on an upper side of platform 31 and passes through slot 45a in lever 45. A section 47a of thumb screw 47 is narrowed as by being turned on a lathe. Mounted on section 47a of thumb screw 47 is a washer 49 locked against lever 45 by spring 50 which is mounted that socket 34 serves a dual purpose of seating the diamond in dop 13 and housing the means of connecting dop 13 with platform 31. This coaxial positioning of diamond 14 with its lateral or horizontal angular adjustment means 32 permits lateral facet corrections to be made without change of position of the diamond relative to its grain.

"The diamond 14 is set in the dop 13 in any of the usual manners, the one shown in the drawings consisting of two pivoted arms 52 which are moved inwardly or outwardly simultaneously, as by the operating screw 53, and they either release the diamond or clamp it between the inner ends. This dop is well known in the art, and is used for polishing of facets or faces on the bottom of the diamond and is readily adapted to be machined for connection with my device 23 as above set forth.

In Figure 4, however, is shown a dop 54 with original and vnew features for polishing of faces or facets on the top of diamond 55, see Fig. 6, and also for superimposing socalled brilliant facets Vupon the basic bottom facets. The faces on the top ofthe diamond are those which are polished from the edge of the table or flat upper surface of the diamond down to the girdle; the rough round ring which encircles the diamond and separates the top of the diamond yfrom the bottom thereof.

Itisobvious thatthe dop 54;may be similarly. connected Cal to my device 23 by extending and threading hollow tube 56 to receive screw threaded pin 32 connecting it to platform 31 as does socket 34in threaded dop 13.

The diamond is inserted in a pot 56, which is a hollowed tube for receiving the point or culet of the diamond. A at finger 57 secured by means of threaded screw 58 to base of channel`59c at top of post 59 is raised or lowered to clamp or release finger 57 upon table of diamond 55. The yraising or lowering of post 59 is accomplished by turning of operating thumb screw 60 which is rotatable but stationarybeing held in position by forked arm 61. Threaded upon inner end of screw 60, which passes through dop 54, see Fig. 5, horizontally entering through slot 62, is a shuttle 63 with two raised arms 64 which has a to and fro motion as determined by use of operating screw 60. Between the two arms 64 is handle 65a of at and angled lever 65. Lever 65 is pivotally held in position in slot 66 by means of cross-pin 67. The vopposite handle 65b of lever 65 rests in slot 59a of post 59. The direction of shuttle 63 will determine the direction of pressure of handle 65b upon limits of slot 59a in post 59 and ythus Acause the raising or lowering of said post 59. There is a groove 5911 at bottom of post 59 to permit free movement'of arms 64 on shuttle 63.

As indicated in Fig. 6, tube 56 may be exteriorly threaded to receive athreaded nut (as shown) having at springs mounted on opposite vsides thereof acting as stabilizing means to rprevent the st one from moving in the tube when-the clamp`57pis'released for turning the tube to make a new'facet'on the stone.

The operation of thumb screw 60 will thus make possible a simple but'dependableand leffective device for releasing or-clamping 'down on diamond in a flat plane through Vthe nove1-medium of the lever 65 and slotted post 59.

vThe usefand'operation of my invention will be practically obvious lfrom theherein description, but I want to offer the following' further Yexplanation in relation thereto.

It will lbe seen thatthe'rotation of shaft 28 inits horizontal axis will cause plate A31 to swing upward or downward and the dop11 3 along with plate 31, thus adjusting the vertical angle ofthe d iamond ,14 as desired.

It will also be seen that the rotation ofpin 32 in its sleeve 33 on a'vertical axis will cause the dop 13 to rotate along lwith vertical'pin'32, thus adjusting the horizontal angle of diamond 14 as desired.

It--will`be seen furtherthat if the tong 10 has been levelled by means of adjustment of legs 11, the rotation of rod or-pin'17 in its vertical axis to search for the grain lalong which the diamond will grind, will not affect or alter the previous horizontal and vertical angular settings of the diamond 14 clamped in dop 13 by arms 52.

This invention provides a positive controlled vertical adjustment-withoutany lag in reversal of direction owing to spring -lockingtfeature in operation of lever 36.

AV controlledhorizontal orlateral angular adjustment is provided in conjunction with a simultaneous swing of the grips, clamps or arms` 52 which hold the diamond. Previous devices for rotating the diamond horizontally have necessitated the release of grips since such previous devices were` operated independently of the diamond cup or holder.

The simultaneous swing ofthe grips or clamps with the diamond in the-horizontalangular adjustment is essential as is obvious to those -versed in the art, since release of thegripsis precarious and infact will almost certainly result ink .upsetting the position of the'diamond in its holder.

I have therefore sought to use conventional dops in conjunction with -my angle'setting device and have devised my novel clamping mechanism ,asindicated hereinabove which lisespecially-effectivefor use and insertion in standard-diamond dops. Mydiamond dop'54 is thereforeesimilar toa .standard dopusedby those-skilled in the art, buthiscompletely-novel and original in the use of the clamping mechanism 57 as embodied in the post 59 operated by the lever 65 in a distinctly novel manner.

It will be understood that my device is adapted to be used with any other dop and securing means for the diamond than the one described.

While I have shown a preferred embodiment of my invention, it is to be understood that changes and variations may be resorted to in the elements, combinations and operation of my invention, and I reserve my rights to such changes and variations as are within the spirit of this specification, and the scope of the claims hereunto appended.

What I claim as new and want to protect by Letters Patent of the United States, is:

1. A cutting and polishing adjusting device for simultaneously swinging diamond clamping means while regulating the lateral angular adjustment of a stone to a cutting wheel comprising an adjustable tong, a rigid rod rotatably mounted on one end of said tong, a yoke depending from said rod, a shaft rotatably mounted on said yoke, a platform carried by said shaft, a dop mounted on said platform, a socket in said dop for seating the stone, clamping means on said dop for retaining the stone in said socket, means for rotating said shaft for vertical angle adjustment of said dop, a rotatable pin mounted within said dop for adjusting the lateral angle of said socket, whereby the position of the stone clamped in said socket is unaffected by simultaneous rotation of said yoke, said shaft or said pin.

2. A device according to claim 1 wherein said dop is mounted on one end of said platform and said pin is coaxial with said socket.

3. A device according to claim 2 wherein said shaft rotating means comprises a lever pivotally mounted upon one end of said shaft, operable means for directly adjusting the angle of said lever and resilient means engaging said lever and counteracting said operable means to effect immediate positive vertical adjustment of said dop.

4. A device according to claim 2 wherein means is disposed on said platform for rotating said pin, said means comprising a lever pivotally mounted on one end of said pin, operable means for directly adjusting the angle of said lever, resilient means engaging said lever and counteracting said operable means effecting immediate positive lateral adjustment of said socket.

5. A device according to claim 1 wherein said dop is mounted at right angles to said platform to position the stone centrally beneath said yoke in all vertical, lateral and horizontal adjustments of said device.

6. A device according to claim 1 wherein said dop has a center bore, a slotted post removably mounted in said bore, said post having a horizontal clamp mounted on the outer end thereof, angular means mounted within said slot and means cooperating with said angular means for raising and lowering said post within said bore to clamp and release the stone in said socket.

7. A cutting and polishing adjusting device for controlling the position of a stone on a polishing and cutting Wheel comprising an adjustable tong, a rigid rod rotatably mounted on one end of said tong, a yoke depending from said rod, a shaft rotatably mounted on said yoke, a platform carried by said shaft, a dop mounted on one end of said platform, a socket in said dop for seating the stone therein, clamping means on said dop for retaining the stone in said socket, means for rotating said shaft for vertical angle adjustment of said dop comprising a lever pivotally mounted upon one end of said shaft, operable means for directly adjusting the angle of said lever and resilient means engaging said lever and counteracting said operable means; a rotatable pin mounted within said dop for adjusting the lateral angle of said socket and coaxial therewith, means for rotating said pin comprising a second lever pivotally mounted on one end of said pin, a second operable means for directly adjusting the angle of said second lever, a second resilient means engaging said second lever and counteracting said second operable means, whereby the position of the stone clamped in said socket is unaffected by simultaneous rotation of said yoke, said shaft or said pin.

8. A dop for use in combination with a cutting and polishing adjusting device comprising a threaded socket for seating the stone, a nut mounted on said socket, at springs oppositely disposed on said nut for stabilizing the stone during rotation of said socket, a center bore, a slotted post removably mounted in said bore, said post having a horizontal clamp mounted on the outer end thereof, angular means mounted within said slot and shuttle means cooperating with said angular means for raising and lowering said post within said bore to clamp and release the stone in said socket.

References Cited in the file of this patent UNITED STATES PATENTS 698,521 Kneip Apr. 29, 1902 1,171,979 Rixson Feb. 15, 1916 1,490,063 Tower Apr. 18, 1924 1,668,145 Dean May 1, 1928 2,308,739 Binns Ian. 19, 1943 2,311,251 Rees Feb. 16, 1943 2,383,619 Rosner Aug. 28, 1945 2,388,751 Levy Nov. 13, 1945 2,476,702 Colbath July 19, 1949 2,484,574 Leiman Oct. 11, 1949 2,530,421 Barness et al Nov. 2l, 1950 FOREIGN PATENTS 655,042 Great Britain July 11, 1951 

